<?php

// uncomment this line for testing
//set_site_transient( 'update_plugins', null );

/**
 * Allows plugins to use their own update API.
 *
 * @author Pippin Williamson
 * version 1.6.5
 */
class TC_plug_updater {
	private $api_url  = '';
	private $api_data = array();
	private $name     = '';
	private $slug     = '';
  private $version     = '';
  private $wp_override = false;

	/**
	 * Class constructor.
	 *
	 * @uses plugin_basename()
	 * @uses hook()
	 *
	 * @param string $_api_url The URL pointing to the custom API endpoint.
	 * @param string $_plugin_file Path to the plugin file.
	 * @param array $_api_data Optional data to send with API calls.
	 * @return void
	 */
	function __construct( $_api_url, $_plugin_file, $_api_data = null ) {
		$this->api_url  = trailingslashit( $_api_url );
		$this->api_data = urlencode_deep( $_api_data );
		$this->name     = plugin_basename( $_plugin_file );
		$this->slug     = basename( $_plugin_file, '.php');
		$this->version  = $_api_data['version'];
    $this->wp_override = isset( $_api_data['wp_override'] ) ? (bool) $_api_data['wp_override'] : false;

		// Set up hooks.
		$this->init();$this->init();
	}

	/**
	 * Set up Wordpress filters to hook into WP's update process.
	 *
	 * @uses add_filter()
	 *
	 * @return void
	 */
	private function init() {
		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_update' ) );
    add_filter( 'plugins_api', array( $this, 'plugins_api_filter' ), 10, 3 );
    remove_action( 'after_plugin_row_' . $this->name, 'wp_plugin_update_row', 10, 2 );
    add_action( 'after_plugin_row_' . $this->name, array( $this, 'show_update_notification' ), 10, 2 );
    add_action( 'admin_init', array( $this, 'show_changelog' ) );
	}



	/**
   * Check for Updates at the defined API endpoint and modify the update array.
   *
   * This function dives into the update API just when WordPress creates its update array,
   * then adds a custom API call and injects the custom plugin data retrieved from the API.
   * It is reassembled from parts of the native WordPress plugin update code.
   * See wp-includes/update.php line 121 for the original wp_update_plugins() function.
   *
   * @uses api_request()
   *
   * @param array   $_transient_data Update array build by WordPress.
   * @return array Modified update array with custom plugin data.
   */
  public function check_update( $_transient_data ) {

    global $pagenow;

    if ( ! is_object( $_transient_data ) ) {
      $_transient_data = new stdClass;
    }

    if ( 'plugins.php' == $pagenow && is_multisite() ) {
      return $_transient_data;
    }

    $_response = $_transient_data->response;

    if ( ! empty( $_response ) && ! empty( $_response ) && false === $this->wp_override ) {
      return $_transient_data;
    }

    $version_info = $this->api_request( 'plugin_latest_version', array( 'slug' => $this->slug ) );

    if ( false !== $version_info && is_object( $version_info ) && isset( $version_info->new_version ) ) {

      if ( version_compare( $this->version, $version_info->new_version, '<' ) ) {

        $_response[ $this->name ] = $version_info;

      }

      $_transient_data->last_checked           = time();
      $_transient_data->checked[ $this->name ] = $this->version;

    }

    return $_transient_data;
  }




  /**
   * show update nofication row -- needed for multisite subsites, because WP won't tell you otherwise!
   *
   * @param string  $file
   * @param array   $plugin
   */
  public function show_update_notification( $file, $plugin ) {

    if ( is_network_admin() ) {
      return;
    }

    if( ! current_user_can( 'update_plugins' ) ) {
      return;
    }

    if( ! is_multisite() ) {
      return;
    }

    if ( $this->name != $file ) {
      return;
    }

    // Remove our filter on the site transient
    remove_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_update' ), 10 );

    $update_cache = get_site_transient( 'update_plugins' );

    $update_cache = is_object( $update_cache ) ? $update_cache : new stdClass();

    if ( empty( $update_cache->response ) || empty( $update_cache->response[ $this->name ] ) ) {

      $cache_key    = md5( 'edd_plugin_' . sanitize_key( $this->name ) . '_version_info' );
      $version_info = get_transient( $cache_key );

      if( false === $version_info ) {

        $version_info = $this->api_request( 'plugin_latest_version', array( 'slug' => $this->slug ) );

        set_transient( $cache_key, $version_info, 3600 );
      }

      if( ! is_object( $version_info ) ) {
        return;
      }

      if( version_compare( $this->version, $version_info->new_version, '<' ) ) {

        $update_cache->response[ $this->name ] = $version_info;

      }

      $update_cache->last_checked = time();
      $update_cache->checked[ $this->name ] = $this->version;

      set_site_transient( 'update_plugins', $update_cache );

    } else {

      $version_info = $update_cache->response[ $this->name ];

    }

    // Restore our filter
    add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'check_update' ) );

    if ( ! empty( $update_cache->response[ $this->name ] ) && version_compare( $this->version, $version_info->new_version, '<' ) ) {

      // build a plugin list row, with update notification
      $wp_list_table = _get_list_table( 'WP_Plugins_List_Table' );
      # <tr class="plugin-update-tr"><td colspan="' . $wp_list_table->get_column_count() . '" class="plugin-update colspanchange">
      echo '<tr class="plugin-update-tr" id="' . $this->slug . '-update" data-slug="' . $this->slug . '" data-plugin="' . $this->slug . '/' . $file . '">';
      echo '<td colspan="3" class="plugin-update colspanchange">';
      echo '<div class="update-message notice inline notice-warning notice-alt">';

      $changelog_link = self_admin_url( 'index.php?edd_sl_action=view_plugin_changelog&plugin=' . $this->name . '&slug=' . $this->slug . '&TB_iframe=true&width=772&height=911' );

      if ( empty( $version_info->download_link ) ) {
        printf(
          __( 'There is a new version of %1$s available. %2$sView version %3$s details%4$s.', 'easy-digital-downloads' ),
          esc_html( $version_info->name ),
          '<a target="_blank" class="thickbox" href="' . esc_url( $changelog_link ) . '">',
          esc_html( $version_info->new_version ),
          '</a>'
        );
      } else {
        printf(
          __( 'There is a new version of %1$s available. %2$sView version %3$s details%4$s or %5$supdate now%6$s.', 'easy-digital-downloads' ),
          esc_html( $version_info->name ),
          '<a target="_blank" class="thickbox" href="' . esc_url( $changelog_link ) . '">',
          esc_html( $version_info->new_version ),
          '</a>',
          '<a href="' . esc_url( wp_nonce_url( self_admin_url( 'update.php?action=upgrade-plugin&plugin=' ) . $this->name, 'upgrade-plugin_' . $this->name ) ) .'">',
          '</a>'
        );
      }

      do_action( "in_plugin_update_message-{$file}", $plugin, $version_info );

      echo '</div></td></tr>';
    }
  }







  /**
   * Updates information on the "View version x.x details" page with custom data.
   *
   * @uses api_request()
   *
   * @param mixed   $_data
   * @param string  $_action
   * @param object  $_args
   * @return object $_data
   */
  public function plugins_api_filter( $_data, $_action = '', $_args = null ) {


    if ( $_action != 'plugin_information' ) {

      return $_data;

    }

    if ( ! isset( $_args->slug ) || ( $_args->slug != $this->slug ) ) {

      return $_data;

    }

    $to_send = array(
      'slug'   => $this->slug,
      'is_ssl' => is_ssl(),
      'fields' => array(
        'banners' => false, // These will be supported soon hopefully
        'reviews' => false
      )
    );

    $cache_key = 'edd_api_request_' . substr( md5( serialize( $this->slug ) ), 0, 15 );

    //Get the transient where we store the api request for this plugin for 24 hours
    $edd_api_request_transient = get_site_transient( $cache_key );

    //If we have no transient-saved value, run the API, set a fresh transient with the API value, and return that value too right now.
    if ( empty( $edd_api_request_transient ) ){

      $api_response = $this->api_request( 'plugin_information', $to_send );

      //Expires in 1 day
      set_site_transient( $cache_key, $api_response, DAY_IN_SECONDS );

      if ( false !== $api_response ) {
        $_data = $api_response;
      }

    }

    return $_data;
  }




	/**
	 * Disable SSL verification in order to prevent download update failures
	 *
	 * @param array $args
	 * @param string $url
	 * @return object $array
	 */
	function http_request_args( $args, $url ) {
		// If it is an https request and we are performing a package download, disable ssl verification
		if( strpos( $url, 'https://' ) !== false && strpos( $url, 'edd_action=package_download' ) ) {
			$args['sslverify'] = false;
		}
		return $args;
	}

	/**
   * Calls the API and, if successfull, returns the object delivered by the API.
   *
   * @uses get_bloginfo()
   * @uses wp_remote_post()
   * @uses is_wp_error()
   *
   * @param string  $_action The requested action.
   * @param array   $_data   Parameters for the API action.
   * @return false|object
   */
  private function api_request( $_action, $_data ) {

    global $wp_version;

    $data = array_merge( $this->api_data, $_data );

    if ( $data['slug'] != $this->slug ) {
      return;
    }

    if( $this->api_url == trailingslashit (home_url() ) ) {
      return false; // Don't allow a plugin to ping itself
    }

    $api_params = array(
      'edd_action' => 'get_version',
      'license'    => ! empty( $data['license'] ) ? $data['license'] : '',
      'item_name'  => isset( $data['item_name'] ) ? $data['item_name'] : false,
      'item_id'    => isset( $data['item_id'] ) ? $data['item_id'] : false,
      'slug'       => $data['slug'],
      'author'     => $data['author'],
      'url'        => home_url()
    );

    $request = wp_remote_post( $this->api_url, array( 'timeout' => 15, 'sslverify' => false, 'body' => $api_params ) );

    if ( ! is_wp_error( $request ) ) {
      $request = json_decode( wp_remote_retrieve_body( $request ) );
    }

    if ( $request && isset( $request->sections ) ) {
      $request->sections = maybe_unserialize( $request->sections );
    } else {
      $request = false;
    }

    return $request;
  }

  public function show_changelog() {

    global $edd_plugin_data;

    if( empty( $_REQUEST['edd_sl_action'] ) || 'view_plugin_changelog' != $_REQUEST['edd_sl_action'] ) {
      return;
    }

    if( empty( $_REQUEST['plugin'] ) ) {
      return;
    }

    if( empty( $_REQUEST['slug'] ) ) {
      return;
    }

    if( ! current_user_can( 'update_plugins' ) ) {
      wp_die( __( 'You do not have permission to install plugin updates', 'easy-digital-downloads' ), __( 'Error', 'easy-digital-downloads' ), array( 'response' => 403 ) );
    }

    $data         = $edd_plugin_data[ $_REQUEST['slug'] ];
    $cache_key    = md5( 'edd_plugin_' . sanitize_key( $_REQUEST['plugin'] ) . '_version_info' );
    $version_info = get_transient( $cache_key );

    if( false === $version_info ) {

      $api_params = array(
        'edd_action' => 'get_version',
        'item_name'  => isset( $data['item_name'] ) ? $data['item_name'] : false,
        'item_id'    => isset( $data['item_id'] ) ? $data['item_id'] : false,
        'slug'       => $_REQUEST['slug'],
        'author'     => $data['author'],
        'url'        => home_url()
      );

      $request = wp_remote_post( $this->api_url, array( 'timeout' => 15, 'sslverify' => false, 'body' => $api_params ) );

      if ( ! is_wp_error( $request ) ) {
        $version_info = json_decode( wp_remote_retrieve_body( $request ) );
      }

      if ( ! empty( $version_info ) && isset( $version_info->sections ) ) {
        $version_info->sections = maybe_unserialize( $version_info->sections );
      } else {
        $version_info = false;
      }

      set_transient( $cache_key, $version_info, 3600 );

    }

    if( ! empty( $version_info ) && isset( $version_info->sections['changelog'] ) ) {
      echo '<div style="background:#fff;padding:10px;">' . $version_info->sections['changelog'] . '</div>';
    }

    exit;
  }
}